Office 365 engineer

About Harris

Harris is a leading provider of financial management and Customer Information Systems (CIS) software solutions serving Public Sector, Schools, Utilities, and Healthcare organizations across North America.

Since 1976, Harris has built a reputation for delivering robust, feature-rich solutions and long-term customer partnerships.

 

About the Role

Our Corporate IT team seeking an experienced Office 365 Engineer, with a strong emphasis on Exchange, Teams and, Active Directory (AD)/identity management.

This role is responsible for designing, implementing, and maintaining Exchange (on-premises and hybrid), Teams and, Azure AD (Microsoft Entra ID).

 

Key Responsibilities

 


* Lead the design, configuration, and ongoing administration of Exchange Online within the Microsoft 365 tenant, including mailbox provisioning, shared/resource mailboxes, distribution groups, Tenant to Tenant migration projects.


* Architect and manage end-to-end mail flow including send/receive connectors, transport rules, smart host relay, third-party gateway integrations (e.g., Mimecast, Proofpoint), and DNS records (MX, SPF, DKIM, DMARC)


* Serve as the primary owner of Exchange Online Protection (EOP) and Microsoft Defender for Office 365, configuring and tuning anti-phishing, anti-spam, safe links, safe attachments, and protection policies


* Act as the Tier 3/4 escalation point for all email-related incidents including NDRs, mail flow failures, spoofing, BEC attacks, and malware delivery events, with full Root Cause Analysis (RCA) documentation


* Design, deploy, and maintain Microsoft 365 DLP policies across Exchange Online, Teams, SharePoint, and OneDrive in alignment with GDPR, and HIPAA requirements, tuning conditions and exceptions to minimize false positives


* Administer Microsoft Purview compliance solutions including retention policies, sensitivity labels, MRM, litigation holds, eDiscovery (Content Search and Premium), communication compliance, and insider risk management policies


* Manage email authentication posture by continuously validating and enforcing SPF, DKIM, and DMARC configurations, reviewing Microsoft Secure Score recommendations


* Develop and maintain PowerShell automation scripts for Exchange Online bulk operations, user lifecycle workflows (onboarding/offboarding), compliance reporting, and Microsoft Graph API integrations with ITSM or HRIS platforms


* Follow ITIL and change management best practices for all platform changes — including raising RFCs, participating in Change Advisory Board (CAB) reviews, maintaining incident/problem records, and producing post-implementation reviews (PIR) for major changes impacting Exchange, Teams, or voice environments


* Administer the Microsoft Teams — managing messaging, meeting, and app permission policies, Teams Rooms (MTR) devices, and providing Tier 2/3 escalation support for Teams incidents


* Administer the Entra ID - identity mana...